UH190 Plug-on Transmitter OPERATING INSTRUCTIONS and trouble-shooting guide LECTROSONICS, INC.
INTRODUCTION Thank you for selecting the Lectrosonics UH190 belt-pack transmitter. The UH190 combines over 80 years of engineering experience with the very latest components, in a design that addresses the most demanding professional applications. The design of the UH190 was the direct result of numerous conversations with users, staging and touring companies and dealers across the US.
Plug-on Transmitter GENERAL TECHNICAL DESCRIPTION The UH190 transmitter is comprised of a number of functional subsystems as shown in the block diagram below. The 190 system uses 15kHz deviation. The transmitter circuits are all regulated to allow full output power from the beginning (9 Volts) to the end (7 Volts) of battery life. The oscillator crystal is shock mounted to provide ruggedness. The input amplifier uses a Motorola 33078 op amp for ultra low noise operation.
CONTROLS AND FUNCTIONS The UH190 may be used with a wide variety of microphones. The 3-pin XLR type connector on the UH190 allows the transmitter to be used with any dynamic microphone, as well as many two wire positive bias lavalier systems (such as those systems supplied by Lectrosonics). INPUT JACK Standard 3-pin Switchcraft XLR type. Pin 2 is signal, pin 3 is signal ground, and pin 1 is case ground (see sche matic below). The UH190 is self-locking onto a standard microphone.
Plug-on Transmitter OPERATING INSTRUCTIONS 1) Insert the UH190 into the selected microphone. Listen for the “click” that indicates the UH190 has locked on to the microphone. Pull on the mic to insure proper locking has occurred. 2) Turn the power switch to the “MUTE” position on both the transmitter and the receiver. The “MUTE” position allows internal voltages to stabilize before audio signal paths are opened. 3) Hold the microphone as you will when you will be using it.
BATTERY REPLACEMENT The UH190 transmitter is powered by a standard alkaline 9 Volt battery. It is important that you use ONLY an ALKA LINE battery for longest life. Standard zinc-carbon batteries marked “heavy duty” or “long-lasting” are not adequate. They will provide only about 3 hours of operation. Similarly, nicad rechargeable batteries only give 3 hours of opera tion, and will also run down quite abruptly. Alkaline batteries provide about 7.5 hours of operation.
Plug-on Transmitter TROUBLESHOOTING Before going through the following chart, be sure that you have a good battery in the transmitter the red power LED on the transmitter panel should glow brightly. SYMPTOM POSSIBLE CAUSE NO AUDIO IS HEARD BUT RECEIVER RF LED IS ON 1) On/Off switch is in “mute” position receiver or transmitter. 2) Microphone on/off switch is in “off” position. 3) Volume is turned down or off on transmitter or receiver. 4) Receiver not properly connected to other audio equipment.
SPECIFICATIONS AND FEATURES Operating frequencies: 470 to 608 MHz RF Power output: 100 mW (nominal) Frequency stability: ± 0.004% Deviation: ± 15 kHz (max) Spurious radiation: 50 dB below carrier Equivalent input noise: -126 dBV Pre-emphasis: 100us Input level: Nominal 2 mV to 300 mV, before limiting. Greater than 3 Volts maximum, with limiting.
Plug-on Transmitter SERVICE AND REPAIR If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment needs repair. Make sure you have followed the setup procedure and operating instructions. Check out the intercon necting cords and then go through the TROUBLE SHOOTING section in the manual We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop attempt anything other than the simplest repair.
LIMITEDONE ONE YEAR LIMITED YEARWARRANTY WARRANTY The equipment is warranted for one year from date of purchase against defects in materials or workmanship provided it was purchased from an authorized dealer. This warranty does not cover equipment which has been abused or damaged by careless handling or shipping. This warranty does not apply to used or demonstrator equipment. Should any defect develop, Lectrosonics, Inc.
